Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ba12f8f5488d7c…

MALICIOUS

PDF

46.6 KB Created: 2021-06-03 13:01:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 0959a026c661d30c5fd7eee93bf34f6c SHA-1: 5c7907c77f4b6bfc89fd54e7fa1f8b15f5f4a94d SHA-256: 23ba12f8f5488d7ccab318e8a0d931aaf626379f0b138e8932bcca9e6f680684
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs a 'recovery secret' lure, requesting sensitive information under the guise of offering game hacks and free spins. It contains a large number of external links, many of which point to PDF files with similar SEO-optimized titles, suggesting a link farm designed to distribute malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.online/app/406889139/200-free-spins-coin-master-game-hack
    • http://digilib.iailm.ac.id//repository/coin-master-hack-ios-download-2021_GM406889139.pdf
    • http://digilib.iailm.ac.id//repository/roblox-cp_GM431946152.pdf
    • http://digilib.iailm.ac.id/repository/free-robux-groups-2021_GM431946152.pdf
    • http://digilib.iailm.ac.id/repository/free-roblox-accounts-with-robux-2021_GM431946152.pdf
    • http://digilib.iailm.ac.id/repository/easy-how-to-get-free-robux_GM431946152.pdf
    • http://digilib.iailm.ac.id//repository/coin-master-time-hack_GM406889139.pdf
    • http://digilib.iailm.ac.id//repository/get-free-robux-no-human-verification_GM431946152.pdf
    • http://digilib.iailm.ac.id//repository/www-bandicam-com-free-robux_GM431946152.pdf
    • http://digilib.iailm.ac.id//repository/rbx-roblox-robux_GM431946152.pdf
    • http://digilib.iailm.ac.id//repository/coin-master-links-for-today_GM406889139.pdf
    • http://digilib.iailm.ac.id/repository/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://digilib.iailm.ac.id/repository/free-roblox-girl-hair-not-a-model_GM431946152.pdf
    • http://digilib.iailm.ac.id//repository/free-robux-apps-that-work_GM431946152.pdf
    • http://digilib.iailm.ac.id//repository/free-robux-codes-not-used_GM431946152.pdf
    • http://digilib.iailm.ac.id//repository/how-to-get-free-robux-without-human-verification-2021_GM431946152.pdf
    • http://digilib.iailm.ac.id//repository/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdf
    • http://digilib.iailm.ac.id/repository/coin-master-hack-app-2021_GM406889139.pdf
    • http://digilib.iailm.ac.id/repository/roblox-hackprogamers-com_GM431946152.pdf
    • http://digilib.iailm.ac.id//repository/minecraft-esp_GM479516143.pdf
    • http://digilib.iailm.ac.id//repository/free-robux-no-anti-bot-verification_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000052e4.bin
a49c400f9f1c588e56e35035ab89e24b7e11b19b0cb23471b45b66a981607c8f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52E4 30076 bytes
font_01_sfnt_off00009436.bin
322b0d5b629f6df55fd3c77851cbfe7ee71104dfe1b9214827344950ced1d0df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9436 18180 bytes

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